The world’s oceans can no longer sustain the ever-increasing demand for fish. Aquaculture offers an alternative approach – if the production is sustainable and of high quality. INRAE, the Aqualande Group, selective breeding company Les Sources de l’Avance and the French Technical Center for Poultry Breeders and Aquaculture (SYSAAF) reviewed data from 20 years of the company’s rainbow trout breeding program. They compared the growth and feeding needs of trout from this program with those of unselected trout.
Their findings, published in Aquaculture Reports, showed that selected trout require 17% to 20% less forage to achieve the same growth as unselected species. As a result, the environmental impacts of fish farming can be reduced. The locally produced feed, made without fish oil, fishmeal or soy, was also tested on the two groups of fish. Fish fed this “future” feed, which has similar nutritional properties, achieved similar growth performance. These unique results show it selective education Innovative feed sources can be effectively combined to make them aquaculture more sustainable.
Between 1997 and 2019, the Aqualande group conducted a selective breeding program on 10 generations of rainbow trout, based on principles established by INRAE and SYSAAF. They also preserved unselected rainbow trout from the same indigenous population. To determine genetic performance gains, INRAE, Aqualande and SYSAAF participated in the European AquaImpact collaborative research programme, in which they compared growth, morphology, productivity and fillet lipid content of selected and unselected groups of fish.
They also developed sustainable feed based on INRAE research that was done without fish oil, fishmeal or soy to limit non-European imports. This feed was produced with ingredients from France and Europe, such as potato protein and microalgae. For 110 days, trout from both groups were given this feed, while the others were fed standard commercial feed containing fishmeal and fish oil.
The results showed that the trout from the selective breeding program needed 17% to 20% less feed than the unselected trout to achieve the same growth. Moreover, their slices have a high fat content, which improves their nutritional and taste properties. Whether fed sustainable or standard feed, trout from both groups grew at the same rates. The addition of microalgae to the sustainable feed also improved the nutritional quality of the phyllite, which contain the same number of long-chain omega-3s. fatty acids fillet of trout Looking at the standard feed Contains fish oil.
This study shows that selective breeding and sustainable feed development are two important levers to reduce environmental impact planted fish production and accelerating the transition to more sustainable aquaculture.
Marc Vandeputte et al, Genetic gains on growth, survival, forage conversion ratio and quality traits after ten generations of polygenic selection in Oncorhynchus mykiss rainbow trout, fed a standard fish-free, soy-free ‘future’ diet or a ‘future’ diet and Aquaculture Reports (2022). DOI: 10.1016 / j.aqrep.2022.101363
Provided by INRAE - National Agricultural, Food and Environmental Research Institute
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